Fuel lifting and carbureting device



w.A. EDWARDS. f Y FUEL LIFTING ANQ CARBJRETING DEVICE. APPucATloN nin mac. w, ma. V v 1,437,048'. Patented Nom-28, 1922.

w. A. EDWARDS.

FUEL LIFTING AND CARBURETING DEVICE.

' APPLICATION FILED DEC. I6. 19.18.

2 SHEETS-SHEET 2f Patented Nov. 2s, 1922.

uNlrEn STATES PArENr o FFI C E WILLIAM A. EDWARDS, 0F CHICAGO, ILLINOIS, ASSIGNOR TO STEWART-WARNER SPEEDOMET-ER CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF VIR- GINIA.

FUEL-LIFTING AND CARBURETING DEVICE.

Application iled December 16, 1918. Serial No. 266,906.

To all lwhom it may concern.' f

Be it known that I, WILLIAM A. EDWARDS, a citizen of the United States, residing in the city of Chicago,.in the county. of Cook and the State of Illinois, have invented certain new and useful Improvements in Fuel Lifting and Carbureting Devices, 0f which the following is a specification, ref wence being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved construction for lifting liquid 'fuel from a low level main supply tank and mixing such fuel with air t0 be fed to an internal combustion engine. It consists in the elements and features of construction `shown and described, as indicated in the claims.

In the drawings:

Figure 1 is a partially diagrammatic view showing conventionally a portion of the engine to be served, comprising the intake manifold thereof, a main low level fuel tank, and in axial section the fuel supply and carbureting connections from the tank to the engine intake. l

" Figure 2 is a view similar to Figure 1, showmg a modified form of a characteristic element of the device.

A represents the intake manifold of an internal combustion engine, B a main fuel supply tank which fis situated at a lower level. C is a pipe which conducts the fuel mixture to the engine intake. D is a'Venturi throat piece at the intake through which the fuel mixture is discharged and further aerated. Eis a duct which extends down in the main fuel supply tank for receiving the liquid fuel from the lower part of said tank.

F is a fitting which is secured in the top of the tank, A, for supporting the duct, E which depends therefrom into the tank. is a metering jet nozzle screwed into the fitting, F, and constituting the discharge terminal of the duct, E, said duct discharging through said nozzle terminal within the pipe, C, said pipe, C, being secured also to the fitting, F, and having air inlet a ertures, c, c, registering with apertures, f, in the fitting, F, when the said pipe is protruded into the fitting. H is a Venturi throat-piece fitted within the pipe, C, around the end of the nozzle, G, so that said nozzle discharges in the Venturi throat at Bussum a point near and preferably a little beyond the narrowest constriction'thereof.

The operation of this device is that when the engine is operating, the partial vacuum produced in' the intake manifold by the intake stroke of the piston, roduces an inrush o f air through the enturi throatpiece, D, vcauses both by entrainment and by the direct suction, a partial vacuum in the pipe, C, and produces an inrush of air through theair apertures, c, and by entrainment at the tip of the nozzle, G, as well as by the direct suction, causes suction to operate in the pipe, F, for lifting the'liquid fuel from the tank, A, and discharging it in a jet through the discharge end of the metering passage, g, of the nozzle, G, and the A relatively high velocity of air passing the end of the nozzle operates for very effective aspiration of the liquid thus discharged and its thorough mechanical admixture with the `air entering through the apertures, 0, so

that the pipe, C, contains substantially a column of vapor, consisting of highly carbureted air which is drawn through the Venturi, D, and further mixed with air,

roducing a proper mixture for` explosion in the cylinders vofthe engine. By reason of the column in the pipe, C, being as stated, vapor Aor carbureted air, as distinguished from a liquid column, a degree of suction which would be entirely inadequate to lift aliquid column from the low tank to the engine intake, will be quite adequate to draw said vapor column into the intake manifold; and this device, therefore, is adapted to operate for supplying the engine with fuel when running so as to produce a much lower degree of suction than would be suflicient -to lift a liquid supply to the same height.-

In Figure 2 there is shown a modification, consisting of the provision of a well,

K, formed by a pipe extension of the tting, F, into which the' duct, E, extends to the bottom thereof, said well having at the bottom a liquid inlet aperture, 7c. The duct, E, inthis modification, is connected to the fitting, F, by means of an intermediate bushing member or threaded sleeve L, which is screwed into the tting, F, said bushing member constituting the terminal and 1mmediateconnection of the lower end of the pipe, C, and constituting the support for the discharge nozzle, G, of the duct, E. Said bushing member, has an air passage, Z, extending through it, for admitting atmospheric pressure to the well.

" The lower end of the duct, E, in this construction is closed by a terminal, El, which constitutes a valve ada ted to close the inlet aperture, lo, of the wel K, and the inlet to the duct, E, is provided by means of a lateral aperture, e, near the lower end of said duct, above said valve terminal. The purpose of the construction shown in this modiication is to provide means for adjusting -at will the access ofl liquid fuel from the tank to the feed duct, which is done by rtating the fitting, F, at its seat or bearing in the ltop. wall of the tank, a handle, F2,

being provided forthis purpose, such rotation operating, as will be readily understood to screw the bushing, K, up or down in the fitting, and thereby open or close the inlet port, la, of the well to adjust the opening as found desirable for permitting an adequate supply and preventing an over-supply of liquid fuel to the mixture which is formed in and drawn up through the pipe, C.

1. A fuel feeding and carbureting device for internal combustion engines comprising a low level fuel supply tank and a conduit therefrom to the .engine intake, said conduit consisting .of a duct leading from the lower part of the tank; a larger pipe within which said duct opens near the level of the tank, said larger pipe having an air inlet adjacent to the discharge of sald duct therein, a venturi in the conduit leading to the engine intake open to atmosphere at its intake end, the discharge end of said larger pipe terminating for discharge within the constricted portion of said venturi.

2. rIn theconstruction defined in claim 1, the duct having a terminal discharge nozzle with restricted aperture for the liquid fuel jet delivered-therethrough, and the air inlet of the larger pipe bein located back of the discharge `mouth of sai nozzle.

.3. In the construction defined in claim 1,`

the outer or larger pipe havin a Venturi throat-way -at the part into which the duct conduit therefrom to the engine intake, said conduit consisting of a duct leading from a lower part of the tank and a larger ipe within which said duct opens near the evel of the tank, said larger pipe having an air intake adjacent to the discharge of said duct therein, and having a Venturi throat near the constriction of which the duct discharges, said constriction being beyond the said air inlet into said larger pipe.

5. In combination with a tank from which liquid is to be drawn by engine suction, an air-conducting pipe having an air inlet adjacent the top of the tank; means for conducting the liquid `prior to the point of air intermixture comprising a well suspended from the tank having a liquid inlet from the tank, a liquid conducting pipe suspended from the air conducting pipe, and depending in the well, having a liquid inlet port; means for controlling the liquid inlet to the well, and means operable at will for relative adjustment of the inlet ports and the inlet-controlling means.

6. In the construction defined in claim 5 foregoing, the liquid-inlet controlling means being carried by said depending li uid conducting pipe,and the-well being a justable relatively to said pipe for controlling the liquid inlet.

7. In the construction dened in,claim 5 foregoing, both the well and the liquid conductlng pipe bein suspended from the air conducting pipe, t e inlet port of the well being at the bottom end thereof, the liquidconducting pipe' having at its bottom end a 

